3-point belts in 68 Firebird Convertible

[West]

I have found several companies that make 3-point retrofits for inertial reel seatbelts (including Morris Classics), but I can't find any pictures of an install in a convertible, and can't tell if any of them are made to go in a convertible that doesn't have 3-point seatbelts already from the factory.

Anyone know of a 3-point retrofit for a convertible that didn't come with 3-point seatbelts, and does anyone have pictures of how a 3-point inertial reel seatbelt mounts at the shoulder in a 68 firebird/camaro convertible?

Thanks,

-West
68 Firebird 400 Convertible